In what location does rock melt, allowing for igneous rock formation?
A. Between 1000 km and 2000 km below Earth's surface
B. In Earth's outer core
C. in Earth's inner core
D. Between 50 and 200 km below Earth's surface

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell